Hi Arcom,
I'm not sure I'm seeing the same behaviour you've described when I try it here. Would it be possible to post a small script that shows what you're currently seeing and how you'd like it instead?

I've logged this request as SP-5079 in our internal tracking system. We will be looking to improve the flexibility of the formatting system in Prompt in the future so this request will be helpful when we consider the list of rules.